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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b682cf7fe1fda76d7e2abded12030104bb384ef9e0919ca44abe2f2dfac717b' 
  AND token = 'Ugy4fTsBS1FA68ixd18XARpDdkXXmFW9QFH4G5ZafM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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