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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06bb3720edf35b9b0f855f98870bf86a7c83f7bcca8e67c0b61163fd1ace630' 
  AND token = 'xdQFTegp970pvznQi/xW0sTp1rLVHw55IVSAhZLSavg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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