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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b796fd62b8306383badabc682fb0447c15a7e48f8cc754b0d6253bd8013f8022' 
  AND token = 'PhVNCs2lqAgE2dukomVhdKYl5E2MnrPVW8Y7rRKZ0vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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