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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb89f96703e118ad6e06df3d03407cecbbb6d91d56acaff334164f15cf30aaa0' 
  AND token = 'RPHBu+Ls7kNEcaqpElirTg/gxpOTYopvjVMP8Az7cas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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