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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6906933e071d093b03b87ad1dbad61e5e642c7626230a6a7c651f02e608d3a6f' 
  AND token = 'o3hYrhjo4D7kk4ANHwh4tWyKAfjibdClJ+ui3HJ409g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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