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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce603bdc77eebc2d19d47d7fa4fe28fd607d0159da7feebfb06851474c3b232' 
  AND token = 'grrwzt/tEC3htQPocTX19auavpCkrG65wC+1j7lPwAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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