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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3700d1862ce1a3513aab9fd72e5f6af419f5beebea3627806912eef0ee201ff5' 
  AND token = 'HcpFqskVMpc6eR29jWIaAabzyFje2S0HwLDuKHNgtuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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