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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1182ec2985c43508eb12af6d8a70ed2714c86271c581970d9b44e0dcdec8bcc9' 
  AND token = '9zu6DJoCTJv0ba1GWVvTMLme5ptcZbKvL0/rUKMLvdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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