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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84ad23ad48537d7f3388a25d347d4dd603bd490e07c69f0400a741f1bddf0f8' 
  AND token = 'FDJYJqECmYDM0D8DhfRLx8XcQ12iFtJndPUzhrtMiM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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