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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b212d1cd30723d6943dd3759d4615d470ef2fd29231ab1504e0b631fa28d65' 
  AND token = 'HnnehZN0zCrtizR3e+SY2Z1+7p2qUiYq3YJzMJRjd7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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