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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c50cf145aec3f42c7d0962e0e6cb42a27d30062d9676ab4161528ab464f2e0' 
  AND token = 'JDDbU2hP/cbRr4eR9iAyz4PsHuUvXDa8hic/4PyL7iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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