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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b38174a0956225c377a507ac9f4329a48e05e8d1298ae15bde5ca3de4ef88f' 
  AND token = '0rJzhy79tZpH7I2SSfjvaxwlQ39guSvWf54EOlbr88k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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