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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687706cf23c2431023eaae7ba1ab8122477df6a5ad495fc9c5a5593deffb105b' 
  AND token = '9nZsU7sy1SxA9KT4F5F/rzOAsbgNtk3PEs4JFHOPH6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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