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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7756f1720f0cb89914d3a91f13cf7dbaaa4baef4f3d0464fa4bb1545de66a8' 
  AND token = 'bQXXopCz95MNrquTTM1pKLSTd62q2m2VxElExEJVcTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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