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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352c122ef677e04b4b9512994a744643b5b19976cae782b392bf4bef2d21e65c' 
  AND token = '5cFO03AEuFdOJSW/ne22w15Q12cdwgF8UY6a0Esb6wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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