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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f563a4cde54b2c69e89525513ac82c224aa79262b4ec0273a44a95d93d30d3e' 
  AND token = 'g6tqNyMauWrIab0vNlC4IL08+oXHhjs3o5dLT1R+3Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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