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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead5adc114d88de73fcddddeff23e4ff32facbd7fd91642f9d4606a39e737fe3' 
  AND token = 'w8DhP+zpobm63xFlEVw8cpCUO8Bj2mvbskeSxnpU7PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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