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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac0294876fda8f7cffa7b2ad179b0dc49c61c7d73332c2c0477d2fa9d5f5418' 
  AND token = 'ttUQctwtMD1espeUax+lOMg3ar6lJMypbX2AhuhLpkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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