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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04597a31a0aa3eab389ed76ddb67e4a2ab004a1a56be1369d1a4fb30defdec0' 
  AND token = 'zMcJJBkUlNRDo/JSznDrnIi3H1G4zq6LtzR9A0I++Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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