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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882814fd397f914dd58e6159360e605dafbd3ed6c468273d03510df776c23a08' 
  AND token = 'j5AEcwrhI6MJlGEYHN3y3e0w4K8Qr8d33EkxnxuWnwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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