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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db74600c5ddec473e15cbbdff1a52eb2c4bd5afc9b695b7370cdb0f62d52d465' 
  AND token = 'qv5sY43S9tNRBVsSqswdH/8+f5NAShZP+PzU+Ef0HiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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