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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9794d7e41ca28de39d3ccab57cd20a3d6a2fdc927f3d1cff90f80fc399ba0b33' 
  AND token = 'xd64Bp4C1qo7QvYq8Oom4yE/kXeu8LJM48ywHnBBo3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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