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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbf6e9f339c94699af01598cbb2cbd6bddfcf58bd31a211239e529f6ae9524f' 
  AND token = 'D6G6jm1XDOdRGsmnoLmiqonzSNv5xJkvpbSfdIr/ngM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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