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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0652adf16e7d005dc3109aef602bae84dab1f12f286e24ba72135a8bc42d95b8' 
  AND token = 'FHnJAKd8SKr47yXfg9/V5fM74DHaUEf9CtOGim0TRhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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