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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '451d65f891b39b36d550d2a8bf546a47bde8d88f56a34f76dc86dafaec06f476' 
  AND token = 'Qp6GF8OU4ln4F2pufvnKv00MkB8h26j7oHEsJSqlcvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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