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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8dd1d2738d7e0c4cfdf95708b3370de8c11765d0e85a53c9bd0270aa10b7d04' 
  AND token = 'v83ZRYRxinvundLfK7xvkbDp2/FsaNr+F4XIajs3z4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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