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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac0597900fc6325d4c898b0d71c09ca563b45e6717a2d55dfa619728b0f43fe' 
  AND token = '6g98mTBO+p3mFxOeJtfyjWtnlJoxpKeYWgh9EK0Lt0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}