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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8adab878eab242526767e2cad2ab370ef359fcb8412de4b1b2b4b68fe001134' 
  AND token = 'EV0pEB4wSKJVWvwY1qmNCd87VK6FZt2xAsqPb9G5s2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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