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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d740875605589d853f7ce8bf33e732f99ef70ab68ba6986719082d0d843d8c2' 
  AND token = 'WDdh+dnzPF5F6OcJTy8tJap+LgL4X/tuRB9lDHlEP/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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