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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11b14300e6b034656968d4829ad9f1cddf9542803bfa15c610ce583d011837d' 
  AND token = 'p8zwh6NcPqBmB6nwiGj6q2NZwwTkkJIu40lfzdt6ePw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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