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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9ea2ab187defab199da4faf8b7c07a33b5ed7123a5cdd2c3c65eb30983f5f6' 
  AND token = 'AddmXc6M7zd1CwHCPV7qmvp41OSDx7i8BFD9U4OzXwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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