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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f6bd5d00ac0b4d92a4db1bb76fd26e8c7e51e964b57a78704b36ebce062fac' 
  AND token = 'NGskT95OEGzAcEctROKwGpRDEsA/ZLqFkzIluXaiwFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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