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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e262b607fce5c0e7d1c4be438621209a8e1ade64e16b61cf4c0227dd9a026c52' 
  AND token = 'YnjKfcN753RqOlm3S5j4JnZj6aoe2jsmHjO3W+PeRMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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