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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57bd623d45cad038d87d8bff72a76707745a4d3700547ffcaed9cee0109d8bd0' 
  AND token = 't8M5CMgIUFOjZK+BgD8h0TdfASkQQojIe8BWOmoI6e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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