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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9778b5ae6fbe59519fcf096dea0e1b6561605a80dd2592f92340e1ec2aca1f78' 
  AND token = '2vEeQfwsHw5Q9QPHtAYWWlyXl8Ju8oVi9thbmXRF/5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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