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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f8f3df4e02a0db85d937d3406c62efd3115829b426e99d0231f175f3bfc37c' 
  AND token = 'aRoIxoAbFEbY23oZB3l1DpuidRFPRzc2OyuAfzAtK4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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