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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0023b3c26070091846a777ff762c6c8707e549f0271b29b2bb92613fc384d7a7' 
  AND token = 'Hy+EmZKZHdcvHq1cXF8J3h0HTqF18A+X4O0qXdh6nZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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