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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3603026e8f220468c83fae5473968d9c3a42645fc255724ca864fdbc55eab02a' 
  AND token = 'qypNse/YcW6wVp1Pl6+KOOQXpKtZk0exK2gxbq+WHHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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