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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c543aef54528c074fe28de302034677a8aa60aae8dd37f0d2f7b9e24e43be986' 
  AND token = 'DViF8O0WaBfoi0OjqPrO2WA9bJE4f9TwKIQPqpQxRFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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