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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638551cc71271c676c3692bf323a127151723308673e88e20ec117305059ef8a' 
  AND token = 'ai0QyrsI84enrNgKV47Gg1Mo92EhIJga/2iHoNPG2Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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