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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4c16815acef7e62c172157324c03f198a4301524e9f195ff39ff5d1bf5616e' 
  AND token = 'hY580ODox22QtZeGCqDX9ZKp5N1dxmib2bftnXUcoFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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