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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf99fa6a358b071d39d6a04123674f28c64e8cf37191dea9b734d8a7014d517' 
  AND token = 'yduiqPHBb1enPbtb7N+ZjhQzCp74reRPSfn1I6cvg+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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