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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9387859c6083d4711136a02434bc8188b9dc47276317fa4f5fa01aa7307de6e5' 
  AND token = '7F6mKlds/FQeVotiLJzycgHb6lh3AWqJdaln8LI6WCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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