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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c559cc10274c92e685ebe1b3d116784cf2079bcdb54e273e14ec8ef2eaca3152' 
  AND token = 'xY9Txn1vI7jtGE6SU/9z1I/QVddx/MHn0gUnMKo/RFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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