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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39bfc7a341efdca1ae6849c5908d476984dca5092c9dba3bc7236056bb6f8924' 
  AND token = 'UjYea8F9lTspphmmrA16c/o2TUJ/XqWnLku6evvk5NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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