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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e116a1cacf19b7c44b7a8ac355a2ee4b9962a7aad112c2ffdcd7ae0fdaf10958' 
  AND token = 'mi6OyPH5DPORY2vg2DTZRHPgUrRu7EzJlOLrxtkRHh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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