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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a286466dfe2ca38526034f04090ed02cdd01c2b88a600c6a0f26eab3539ecfa2' 
  AND token = 'ihpQRnw3egjeFpEKjefwmdGaXacVKOGEdsxpMdySfds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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