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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f20073ed0c8d59e93e3109e5c9aac81c74e9777de15c0bd455a9fa81441cde3' 
  AND token = 'sEX/qwUKz3Vp8O7auksCIJMQc8vcxnKzwF8JefBfujc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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