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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e8a113d918882e201bf19023ed7470194b32eba86379bf6c1ed97cf717d22e' 
  AND token = '2hveR53g0V+AaUBz/V8PgZIMHnYSYDaUZMHadTQ28hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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