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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f33122d1b9ededeb9aefaf92191384f95b62fcd62f782428864b2dffa2a1dfb4' 
  AND token = 'hY4YVTFwrqJgVwe3Lac2aDyWp+xvLnAMRhIZMsn1EEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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