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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35af6b1694b2d54d71a2bc89d85a250471c589b42340bda3548983f7f86759e9' 
  AND token = 'g3YeUoArS5uVKRo5kZjbk6mJO3ydbVhZr67p4l02H78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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