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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a43d5cbc6cd8b4bc11340c83a138d07ec2140f0b3817c9e0a89a17a3fd3d42ad' 
  AND token = '++MHVJCxxJ7o9r4BoX60STANwYYfSs+Ysjrgjz9qodI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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