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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3560aa20c492dd64f32270cc2667724ef98b88ac9d23f812a881591c01780a1e' 
  AND token = 'RbaJRI4rbo68TJGuQeMDMQ3tzZg1GFg3PCKK8YQIuiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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