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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9263a320c0f9028bcc5dbe1784626a7fd413d8d5dd056950f0b48c06e32fe6' 
  AND token = 'cJPAhH574eQTlFEnRRZ9VLsQl4PYkCd14CiEtFJ4ppA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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