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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9a157e38ada82003e95355c9841ee7801a9e0b3548f2496592a86d5a957768' 
  AND token = 'tBQ3e+uq3QDI/ehKo2TL/AVy5SEdwzgsJEB7LteWU48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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