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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a7632955edef00e91a3ae66f30128e05dccddfd0b4323adbf0deec462cf560' 
  AND token = '7GYIXtNz90CmYCco6AFVZx9fVuxEkIytD2ZTGjb2U0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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