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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a675696843aa5cb0b9bcb7b0fdaac0d7255656c35fb2ee99a1cb7f38ca79732d' 
  AND token = 'U28tPIpF40ABElWi01fBbVprZNE5+YUryksM8cNusuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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