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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aacbb853ab9a60f3b8f7908d9fc5d406d87f2f5bc76afd3bd10250b4d467afce' 
  AND token = '2odHB73ciAZV+u29uNGXrR0kjkWiopxPG1kSsMqwXwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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