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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac8530eb96c7f895c606a06de3b29104d2c934eeeaf6735e5bef2e1447df19df' 
  AND token = '+EeaNqHeg5FtXHP3wnUqUdzsDo0vxf+NCD2/aJflAWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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