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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6925bae7e9e89705b07d703aa9e0f74d9f0040c01c34353c70caa816eb739e7f' 
  AND token = 'T+PELHharBvQcnNu6ZiHETg1iBTui2iuFasms7i9y/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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