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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d0f7c265a33e33a9070a8bf932e3f2b01fefab2d0fadcc4cf75493dad6e104' 
  AND token = '/snXF2pFMWKtAsugxKYAOyQ1DDV4lyIDt6koSebDCfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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