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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d7de5289835dc8117a42749af01e3abb8d44981b01eba0bb2cfa3f96dbbdd7' 
  AND token = 'MEkIHUHm/3EFah1uZmAUL5XxNtgFK3OBsvsq2Ig354M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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