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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3979a08ba7ec7ee31dd742e96d273e903bfe1e27cfb9ff4d4746ba712842bffa' 
  AND token = 'x4J9fPTXIZw50PLiYrivEf5ca7KMaMmypX0kHxVuPng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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