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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688889d9e8be41a3d1b229f9150617c73a5b231bb5bb71083e416fd535b1c533' 
  AND token = '6hopJzvKnAvMVnS1wljboUcFTXj3baNQo/d8uYnH1LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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