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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9ed58addccc2c9db6823a67056004f28607aacc180cfc6a5422691e62a8c87' 
  AND token = 'VaDXFoYZ1ZdM1y7LSa3crhgusk78vYXyGjVjR5oDVPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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