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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af5ae7657ee90c1175a7e935ed2dba75fe3a7172afa480324cb2d815b639ec4' 
  AND token = 'pB9gDtdQyNh00JHuV1lpFB7Dz7Nxg6rbfsQRgthxCjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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