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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ac7846be945f8db3d878c9771d19838a74ae10076e93e8721423e6caac0330' 
  AND token = 'DFyLlcx+cNO6qavWz7wog8m1YX2RXyaSNeDJXDE0XE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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