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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a1a55a597dcbd17a29454f54f2ce7cb0a12cc443e5db6820f645315404aa03' 
  AND token = 'WHj2JhRINgxHc9l8e8ZDFBN2UZMd923kTi9ff//lGww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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